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d in (-oo:+oo)
4-5*d = (6/7)*d-13/7 // - (6/7)*d-13/7
4-5*d-((6/7)*d)-(-13/7) = 0
(-6/7)*d-5*d+13/7+4 = 0
41/7-41/7*d = 0 // - 41/7
-41/7*d = -41/7 // : -41/7
d = -41/7/(-41/7)
d = 1
d = 1
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